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A model of reconstruction for the oral apparatus of the Ordovician conodont genus Protopanderodus Lindström, 1971

Mellgren, Johanna LU and Eriksson, Mats LU (2006) In Transactions of the Royal Society of Edinburgh. Earth Sciences 97. p.97-112
Abstract
Elements of the Ordovician conodont genus Protopanderodus have been investigated in order to provide a model of reconstruction for its oral apparatus. In total, 4202 elements from the five named species representing this genus in the Swedish Middle Ordovician are included in this study; P. rectus, P. parvibasis, P. graeai, P. robustus, and P. calceatus. The well-preserved specimens were studied in detail for identification of distinct element types and calculations were made to determine element ratios and minimum number of elements in a single apparatus. Three element groups, M, S and P, were recognized for all five species and their relative ratio is indicative of apparatuses consisting of at least 21 elements. The number of element... (More)
Elements of the Ordovician conodont genus Protopanderodus have been investigated in order to provide a model of reconstruction for its oral apparatus. In total, 4202 elements from the five named species representing this genus in the Swedish Middle Ordovician are included in this study; P. rectus, P. parvibasis, P. graeai, P. robustus, and P. calceatus. The well-preserved specimens were studied in detail for identification of distinct element types and calculations were made to determine element ratios and minimum number of elements in a single apparatus. Three element groups, M, S and P, were recognized for all five species and their relative ratio is indicative of apparatuses consisting of at least 21 elements. The number of element types and their distribution, however, varies between the species. The four bicostate species, P. rectus, P. parvibasis, P. graeai, and P. robustus, have similar morphological characters and are believed to belong to the same evolutionary lineage. They possessed apparatuses consisting of M, Sa, Sb1, Sb2, Sc, Pa, and Pb elements. By contrast, the multicostate species P. calceatus is morphologically different and had an apparatus consisting of M1, M2, Sa, Sb, Sc, ”Sd”, Pa, Pb1, and Pb2 elements. These differences indicate that P. calceatus is not so closely related to the other species, possibly representing a separate evolutionary lineage, and may warrant an exclusive generic assignment. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Sweden, conodonts, apparatus reconstruction, Protopanderodus, Ordovician
in
Transactions of the Royal Society of Edinburgh. Earth Sciences
volume
97
pages
97 - 112
publisher
Royal Society of Edinburgh
external identifiers
  • WOS:000244681500001
  • Scopus:33847373483
ISSN
0263-5933
DOI
10.1017/S0263593300001425
language
English
LU publication?
yes
id
41b3595e-351c-49d4-8c49-f293a7ae665c (old id 634407)
date added to LUP
2007-12-18 10:56:57
date last changed
2016-10-13 04:27:31
@misc{41b3595e-351c-49d4-8c49-f293a7ae665c,
  abstract     = {Elements of the Ordovician conodont genus Protopanderodus have been investigated in order to provide a model of reconstruction for its oral apparatus. In total, 4202 elements from the five named species representing this genus in the Swedish Middle Ordovician are included in this study; P. rectus, P. parvibasis, P. graeai, P. robustus, and P. calceatus. The well-preserved specimens were studied in detail for identification of distinct element types and calculations were made to determine element ratios and minimum number of elements in a single apparatus. Three element groups, M, S and P, were recognized for all five species and their relative ratio is indicative of apparatuses consisting of at least 21 elements. The number of element types and their distribution, however, varies between the species. The four bicostate species, P. rectus, P. parvibasis, P. graeai, and P. robustus, have similar morphological characters and are believed to belong to the same evolutionary lineage. They possessed apparatuses consisting of M, Sa, Sb1, Sb2, Sc, Pa, and Pb elements. By contrast, the multicostate species P. calceatus is morphologically different and had an apparatus consisting of M1, M2, Sa, Sb, Sc, ”Sd”, Pa, Pb1, and Pb2 elements. These differences indicate that P. calceatus is not so closely related to the other species, possibly representing a separate evolutionary lineage, and may warrant an exclusive generic assignment.},
  author       = {Mellgren, Johanna and Eriksson, Mats},
  issn         = {0263-5933},
  keyword      = {Sweden,conodonts,apparatus reconstruction,Protopanderodus,Ordovician},
  language     = {eng},
  pages        = {97--112},
  publisher    = {ARRAY(0xad13cf0)},
  series       = {Transactions of the Royal Society of Edinburgh. Earth Sciences},
  title        = {A model of reconstruction for the oral apparatus of the Ordovician conodont genus Protopanderodus Lindström, 1971},
  url          = {http://dx.doi.org/10.1017/S0263593300001425},
  volume       = {97},
  year         = {2006},
}